CMake simplified so that it does nothing but generates MSVC projects

Signed-off-by: Martin Sustrik <sustrik@250bpm.com>
Bug in Windows build fixed

Signed-off-by: Martin Sustrik <sustrik@250bpm.com>
POSIX error codes missing on old Windows versions added

Signed-off-by: Martin Sustrik <sustrik@250bpm.com>
Merge remote-tracking branch 'origin/simple-cmake'
add NN_IPV4ONLY to nn_symbols list

Signed-off-by: Emil Renner Berthing <esmil@mailme.dk>
Signed-off-by: Martin Sustrik <sustrik@250bpm.com>
Emil Renner Berthing added to AUTHORS file

Signed-off-by: Martin Sustrik <sustrik@250bpm.com>